Abstract
An array consisting of homogeneous NiCo2S4 hollow core-shell nanoneedles was fabricated and is shown to enable sensitive electrochemical determination of dopamine (DA). The array was grown directly on a nickel foam (NF) substrate by a two-step hydrothermal process. The hierarchical nanoarray consists of a homogeneous NiCo2S4 nanoneedle core and a NiCo2S4 nanosheet shell. A 3-dimensional micro/nano structure is formed due to the presence of the micropores of the NF. The electrode was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Compared to a plain NF electrode, the NiCo2S4-modified NF electrode displays higher electrocatalytic activity for the oxidation of DA by differential pulse voltammetry (DPV). The sensor, best operated at a typical working voltage of 134 mV (vs. saturated calomel electrode), has a linear response in the 0.5–100 μM DA concentration range and a 0.2 μM detection limit (at S/N = 3). The electrode is selective over ascorbic acid and uric acid.
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This work was supported by the Young Scholars Program of Shandong University and Shandong Provincial Natural Science Foundation, China (ZR2017QB004).
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Dai, H., Chen, D., Li, Y. et al. Voltammetric sensing of dopamine based on a nanoneedle array consisting of NiCo2S4 hollow core-shells on a nickel foam. Microchim Acta 185, 157 (2018). https://doi.org/10.1007/s00604-018-2718-5
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DOI: https://doi.org/10.1007/s00604-018-2718-5